Which version to use which is best

Can you tell me which version has a better signal range? Which is better to use to upgrade to a 3rd party firmwares based on linux? I have a version 2, a version 3, a version 5 and a version 5. The version 5 I am giving to a friend, I will be keeping 2 of the others I just need to know which one provides me with the best performance? :sad: :cry: